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e.g if owner of REPO1 is 'admin1' and owner of REPO1_FORK is 'admin2' it means if 'admin1' starts the review he will not be added as reviewer, but a fallback will be used. It's because the same person shouldn't review its own code.

Please provide more details of who was the owner, and who started the review/pull request.

Yes, I'm sure. Please look at the image below. Here the owner of the fork is Mahesh. He forked my repository and I pushed one of my test changeset to his fork and I asked him to raise a PR to my repo. The screen was captured when he raised the PR.

His user name is mahesh

The fork is in his personal repo.

Author of the PR is shown as mahesh

PR reviewer should've been me, as I'm the owner of the main repo or target repo. But that section contains mahesh - which is a bug.

Ok, confirmed that we use the "current" user instead of target repo owner. Actually in EE edition it's fine, it's a misconfiguration of CE edition. We'll add a fix into the next bugfix release, thanks for posting this !!